Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells

Bo Chen, Mengjin Yang, Xiaojia Zheng, Congcong Wu, Wenle Li, Yongke Yan, Juan Bisquert, Germà Garcia-Belmonte, Kai Zhu, Shashank Priya

Research output: Contribution to journalArticle

203 Scopus citations

Abstract

In the past five years, perovskite solar cells (PSCs) based on organometal halide perovskite have exhibited extraordinary photovoltaic (PV) performance. However, the PV measurements of PSCs have been widely recognized to depend on voltage scanning condition (hysteretic current density-voltage [J-V] behavior), as well as on voltage treatment history. In this study, we find that varied PSC responses are attributable to two causes. First, capacitive effect associated with electrode polarization provides a slow transient non-steady-state photocurrent that modifies the J-V response. Second, modification of interfacial barriers induced by ion migration can modulate charge-collection efficiency so that it causes a pseudo-steady-state photocurrent, which changes according to previous voltage conditioning. Both phenomena are strongly influenced by ions accumulating at outer interfaces, but their electrical and PV effects are different. The time scale for decay of capacitive current is on the order of seconds, whereas the slow redistribution of mobile ions requires several minutes.

Original languageEnglish (US)
Pages (from-to)4693-4700
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume6
Issue number23
DOIs
StatePublished - Dec 3 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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